Equipment and method for washing prodn. of nitrobenzene

A production device and technology of nitrobenzene, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of increasing equipment investment and operating costs, small operating flexibility, and large water consumption, etc., to achieve Increase effective production time, stable operation, and large operating flexibility

Inactive Publication Date: 2006-04-12
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The other is multi-injector series jet washing. Jet washing has good deacidification and phenol removal effects, but the operation flexibility is small, and it cannot be operated within a wide output range. In addition, jet washing relies on high-speed flowing water and alkaline water To pump crude nitrobenzene, so the water consumption is large, the energy consumption is high, and a separator must be installed after each stage of spraying; in addition, spray washing is easy to emulsify water and washing
After the washings are emulsified, larger separators or demulsification operations are required, thus increasing equipment investment and operating costs

Method used

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  • Equipment and method for washing prodn. of nitrobenzene
  • Equipment and method for washing prodn. of nitrobenzene
  • Equipment and method for washing prodn. of nitrobenzene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Nitrobenzene washing production device, including nitration mixed liquid separator 3, lye tank 4, lye delivery pump 2, crude nitrobenzene delivery pump 1, crude nitrobenzene flowmeter 5, lye flowmeter 6, tee 7. Crude nitrobenzene scrubber 8. Washing waste water separator 9. The crude nitrobenzene scrubber 8 is composed of four short pipes 10 connected by connecting pipes 11 . Every short pipe 10 is 4m long and has a diameter of 120mm.

[0027] Specific installation method: the crude nitrobenzene outlet of the nitration mixed liquid separator 3 is connected with the crude nitrobenzene delivery pump 1 inlet through a pipeline, the lye outlet of the lye tank 4 is connected with the lye delivery pump 2 inlet through a pipeline, and the crude nitrobenzene Base benzene delivery pump 1 and lye delivery pump 2 outlet pipelines are respectively equipped with thick nitrobenzene flowmeter 5 and lye flowmeter 6 with display, and are connected with three-way pipe 7, and another int...

Embodiment 2

[0029] The structure of the second embodiment is basically the same as that of the first embodiment, except that: the short pipe 10 of the crude nitrobenzene scrubber 8 is provided with a built-in component 12 .

Embodiment 3

[0031] The production method of washing nitrobenzene comprises storing the equivalent alkali liquor used in the neutralization reaction and the dephenolization reaction in the alkali liquor tank 4, and the nitrification mixed liquor obtained by the nitrification reaction enters the nitrification mixed liquor separator 3, and through this separation operation, the The waste acid contained in the nitration mixture should be as little as possible to reduce the consumption of washing alkali. The pre-separation of waste acid adopts sedimentation separation or hydrocyclone separation. After the nitration waste acid is separated, the crude nitrobenzene to be washed is obtained. The lye is pumped out through the lye delivery pump 2, enters the pipeline, and enters the tee 7 after passing through the lye flow meter 6 with a display, and the crude nitrobenzene after the nitration waste acid is separated is transferred from The nitrification mixed liquid separator 3 is pumped into the pi...

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Abstract

This invention relates to a production unit for washing nitrobenzene, including a separator for nitration mix liquid, a separator for washing waste water, it is characterized by setting a washer between the separator for nitration mix liquid and the separator for washing waste water for washing crude nitrobenzene, the washer for washing crude nitrobenzene is pipe washer. The main operation parameters for the production process are: flow rate is less than or equal to 1.5m / s, the reaction temperature controlled 20-100 DEG C, the operation pressure is less than or equal to system resistance formed from material flow +0.1Mpa, the retention time in the pipe washer for nitrobenzene is less than or equal to 60min. the main advantages of the invention are: less investment for equipment, good washing effect and saving base, water and electric.

Description

(1) Technical field [0001] The invention relates to a chemical product production device and production method, in particular to a production device and production method for refined deacidification and dephenolization of crude nitrobenzene in the production process of nitration of benzene to produce nitrobenzene. (2) Background technology [0002] The crude nitrobenzene produced by benzene under the action of mixed acid contains residual acid and nitrophenol by-products that will bring danger to subsequent production. The process of refining nitrobenzene is to use a certain concentration of lye to neutralize the residual acid in crude nitrobenzene and react nitrophenols with alkali to form phenoxide. The phenoxide is dissolved in water to realize the production process of deacidification and dephenolization to obtain refined nitrobenzene. The above production process is customarily called nitrobenzene washing. [0003] There are two methods of washing nitrobenzene at home...

Claims

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Application Information

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IPC IPC(8): C07C205/06C07C201/16
Inventor 吴剑华王文江郭瓦力
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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